MOLECULAR INTERACTION STUDIES IN THE TERNARY LIQUID MIXTURE OF PYRIDINE + BENZENE + N, N-DIMETHYLFORMAMIDE BY ULTRASONIC VELOCITY MEASUREMENTS

The ultrasonic velocity, density and viscosity have been measured for the ternary mixtures of benzene and N,N-dimethyl formamide with pyridine at 303, 308 and 313K. From the experimental data, adiabatic compressibility (β), intermolecular free length (Lf), free volume (Vf), internal pressure (πi), acoustic impedance (Z), relaxation time (τ), and Gibbs’s free energy (∆G*) have been computed. The excess values of some of the above parameters were also evaluated and discussed in the light of molecular interactions in the mixture